Air Properties Correlations

M.M. Yovanovich

AIRCORR1.MWS

Correlation equation for air properties for temperatures between 250 and 450 kelvin.

Data from Incropera and DeWitt were used to develop the simple correlations.

> restart:

> k:= T->-.2571428571e-7*T^2+.9300000000e-4*T+.6685714286e-3;

> rho:= T->.8997142857e-5*T^2-.9361400000e-2*T+3.168594286;

> cp:= T->3/7000*T^2-113/500*T+7251/7;

> mu:=T->-.3000000000e-10*T^2+.6654000000e-7*T+.1200000000e-5;

> nu:=T->.1005714286e-9*T^2+.3444000000e-7*T-.3466857143e-5;

> alpha:=T->.1600000000e-9*T^2+.4480000000e-7*T-.5320000000e-5;

> Pr:=T-> -.1700000000e-3*T+.7601000000;

Air properties at 300 K.

> airprops300:= evalf(subs(T=300, [k=k(T), rho=rho(T), cp=cp(T), mu=mu(T), nu=nu(T), alpha=alpha(T), Pr=Pr(T)]),4);

>